electrical engineering Mcqs
1. economics of power generation2. analog electronics3. solid state switching circuits4. parallel circuits5. switchgear and protection6. op amp circuits7. transistor audio power amplifiers8. electrostatics9. heating and welding10. multi stage transistor amplifiers11. passive filters12. network theorems13. regulated d c power supply14. a c fundamentals circuits and circuit theory15. electromagnetic induction16. power electronics17. magnetism and electromagnetism18. transformers19. modulation and demodulation20. d c generators21. semiconductor theory22. single phase induction motors23. semiconductor diode24. hybrid parameters25. digital electronics26. oscillators27. earthing or grounding28. single stage transistor amplifiers29. d c motors30. transistor biasing31. amplifiers with negative feedback32. basic electrical33. electronic instruments34. synchronous motors35. field effect transistors fet36. magnetic circuit37. control systems38. industrial drives39. power generation40. series parallel circuits41. transistor tuned amplifiers42. electrical engineering materials43. rectifiers and converters44. integrated circuits45. scr silicon controlled rectifiers46. cables47. polyphase induction motors48. measurement and instrumentation49. transistors50. electrical machine design51. electrolysis and storage of batteries52. electric traction53. transmission and distribution
2551. When either L or C is increased, the resonant frequency of LC circuit ____________?
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A. Decreases

B. Insufficient data

C. Remains the same

D. Increases

2552. In a radio receiver, noise is generally developed at _______________?
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A. Audio stage

B. RF stage

C. IF stage

D. Receiving antenna

2553. _________ is an example of piezoelectric material?
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A. Corrundum

B. Neoprene

C. Quartz

D. Glass

2554. In all base driver amplifiers__________?
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A. ac collector voltage is 180 out of phase with ac base voltage

B. none of the above

C. ac emitter voltage is 180 out of phase with ac base voltage

D. ac collector voltage is in phase with ac base voltage

2555. As the modulation level is increased, the carrier power__________________?
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A. Remains the same

B. Is decreased

C. None of the above

D. Is increased

2556. The encapsulation of transistor is necessary for__________?
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A. preventing radio interference

B. avoiding loss of free electrons

C. mechanical ruggedness

D. preventing photo-emission effects

2557. At series resonance, the circuit offers____________ impedance?
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A. None of the above

B. Maximum

C. Minimum

D. Zero

2558. The control element of an SCR is ______________?
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A. Anode supply

B. Cathode

C. Gate

D. Anode

2559. In a TRF radio receiver, the RF and detection stages are tuned to______________?
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A. IF

B. Audio frequency

C. Radio frequency

D. None of the above

2560. Introducing a resistor in the emitter of a common amplifier stabilizes the dc operating point against variations in____________?
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A. Only the temperature

B. only the ? of the transistor

C. Both Temperature & ?

D. None of the above

2561. Over modulation results in ______________?
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A. Distortion

B. None of the above

C. Weakening of the signal

D. Excessive carrier power

2562. The efficiency of a machine should be as ____________ as possible to reduce the operating cost?
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A. low

B. either of the above

C. none of the above

D. high
2563. A resonant circuit contains ____________elements?
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A. R and C only

B. Only R

C. L and C

D. R and L only

2564. The design of mechanical parts is particularly important in case of __________ speed machines?
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A. any of the above

B. high

C. low

D. medium

2565. A 100 V carrier is made to vary between 160 V and 40 V by the signal. What is the modulation factor ?
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A. 3

B. 5

C. None of the above

D. 6
2566. For a particular material the Hall coefficient was found to be zero. The material is______________?
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A. none of the above

B. metal

C. insulator

D. intrinsic semiconductor

2567. Which of the following factors affect resistivity of metals ?
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A. Cold work

B. All of the above

C. Alloying

D. Age hardening

E. Temperature

2568. In a superhetrodyne receiver, the difference frequency is chosen as the IF rather than the sum frequency because _________________?
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A. The difference frequency is closer to oscillator frequency

B. Lower frequencies are easier to amplify

C. None of the above

D. Only the difference frequency can be modulated

2569. At parallel resonance, the line current is_______________?
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A. Minimum

B. Quite large

C. Maximum

D. None of the above

2570. Solder is an alloy of______________?
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A. silver, copper and lead

B. copper and aluminium

C. tin and lead

D. nickel, copper and zinc

2571. The most commonly used amplifier in sample & hold circuits is______________?
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A. A unity gain inverting amplifier

B. A unity gain non-inverting amplifier

C. An inverting amplifiers with a gain of 100

D. An inverting amplifier with a gain of 10

2572. Thermocouples are mainly used for the measurement of_____________?
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A. eddy currents

B. temperature

C. resistance

D. coupling co-efficient

2573. In a superconductor the value of critical density depends upon______________?
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A. magnetic field strength

B. temperature

C. either (A) or (B)

D. both (A) and (B)
2574. Due to which of the following reasons copper and aluminium are not used for heating elements ?
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A. Both have great tendency for oxidation

B. Both have low melting point

C. Very large length of wires will be required

D. All of the above
2575. If level of modulation is increased ______________ power is increased?
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A. None of the above

B. Carrier as well as sideband

C. Carrier

D. Sideband
2576. In a common emitter, unbypassed resister provides___________?
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A. current series feedback

B. voltage shunt feedback

C. negative voltage feedback

D. positive current feedback

2577. In a transmitter ____________oscillator is used?
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A. RC phase-shift

B. Hartley

C. Wien-bridge

D. Crystal
2578. Most of the common metals have _________ structure?
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A. cubic

B. hexagonal

C. orthorhombic

D. linear

2579. An SCR is turned off by _________________?
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A. Reverse biasing the gate

B. Reducing anode voltage to zero

C. None of the above

D. Reducing gate voltage to zero

2580. Spark plug makes use of which of the following materials for insulation ?
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A. Slate

B. Porcelain

C. Asbestos

D. Glass

2581. is the property of absorbing moisture from atmosphere_____________?
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A. Solubility

B. Porosity

C. Hygroscopicity

D. Viscosity

2582. In an AM wave useful power is carrier by ______________?
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A. Carrier

B. Sidebands

C. Both sidebands and carrier

D. None of the above

2583. Platinum is used in_____________?
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A. grids of special purpose vacuum tubes

B. heating element in high temperature furnace

C. all of the above

D. electrical contacts

E. thermocouple

2584. An n- channel JFET has IDSS=2mA,and Vp=-4v.Its transconductance gm=in mA/V)for an applied gate to source voltage VGS=-2v is___________?
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A. 0.75

B. 0.5

C. 0.25

D. 1

2585. Electrical machines having power outputs ranging from a few kW up to approximately 250 kW may be classified as_____________?
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A. large size machines

B. small size machines

C. any of the above

D. medium size machines
2586. Non-linear resistors______________?
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A. produce harmonic distortion

B. result in non-uniform heating

C. none of the above

D. follows Ohms law at low temperatures only

2587. When SCR is OFF, the current in the circuit is ________________?
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A. Exactly zero

B. Large leakage current

C. None of the above

D. Small leakage current
2588. When SCR starts conducting, then _____________ loses all control?
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A. Cathode

B. Anode

C. None of the above

D. Gate
2589. Carbon bearings are used under which of the following conditions ?
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A. Where corrosive chemical action exists

B. All of the above

C. Where lubrication is difficult or im-possible

D. Where high temperature exists

2590. Effect of moisture on the insulating materials is to________________?
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A. decrease insulation resistance

B. decrease dielectric constant

C. increase dielectric loss

D. decrease dielectric strength

E. all of the above
2591. At parallel resonance, the phase angle between the applied voltage and circuit current is _____________?
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A. 90o

B. None of the above

C. 0o

D. 180o

2592. The voltage gain of a tuned amplifier is____________at resonant frequency
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A. Half-way between maximum and minimum

B. Minimum

C. Zero

D. Maximum
2593. Which of the following is an advantage of stranded conductor over equivalent single conductor ?
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A. All of the above

B. Less liability to break

C. Less liability to kink

D. Greater flexibility

2594. The effective channel length of a MOSFET in a saturation decreases with increase in___________?
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A. Drain voltage

B. Gate voltage

C. Source voltage

D. Body voltage

2595. The major advantage of FM over AM is__________________?
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A. Smaller bandwidth

B. Small frequency deviation

C. Reception is less noisy

D. Higher carrier frequency

2596. At series resonance, the phase angle between applied voltage and circuit is______________?
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A. 0o

B. 90o

C. None of the above

D. 180o

2597. The early effect in a bipolar junction transistor is caused by_______________?
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A. fast turn-off

B. large emitter-base forward bias

C. fast turn-on

D. large collector-base reverse bias
2598. Total number of crystal systems is____________?
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A. 2

B. 12

C. 7

D. 4

2599. In superhetrodyne receiver, the input at mixer stage is________________?
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A. RF and local oscillator signal

B. IF and RF

C. IF and AF

D. RF and AF

2600. Addition of 0.3 to 4.5% silicon to iron ________ the electrical resistivity of iron?
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A. increases

B. decreases

C. does not change